The level is a game within TR1 and TR3 right? Only those clues mean nothing to me.

Yeah, the answer was Venice.
1: All the Fiama Nera use silencers on their pistols, Lara does not.
2: The Masks that the gang members wear. I always thought they looked like evil bunnies hahaha
3: Venice, being a big city, you'd think civilians would be around.
4: Venice, is in Italy, which is famous for great food.